114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
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/* MCIRCLE.CPP--Example for Chapter 5 of User's Guide */
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// MCIRCLE.CPP Illustrates multiple inheritance
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#include <graphics.h> // Graphics library declarations
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#include "point.h" // Location and Point class declarations
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#include <string.h> // for string functions
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#include <conio.h> // for console I/O
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// link with point2.obj and graphics.lib
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// The class hierarchy:
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// Location->Point->Circle
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// (Circle and CMessage)->MCircle
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class Circle : public Point { // Derived from class Point and ultimately
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// from class Location
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protected:
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int Radius;
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public:
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Circle(int InitX, int InitY, int InitRadius);
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void Show(void);
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};
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class GMessage : public Location {
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// display a message on graphics screen
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char *msg; // message to be displayed
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int Font; // BGI font to use
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int Field; // size of field for text scaling
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public:
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// Initialize message
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GMessage(int msgX, int msgY, int MsgFont, int FieldSize,
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char *text);
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void Show(void); // show message
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};
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class MCircle : Circle, GMessage { // inherits from both classes
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public:
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MCircle(int mcircX, int mcircY, int mcircRadius, int Font,
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char *msg);
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void Show(void); // show circle with message
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};
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// Member functions for Circle class
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//Circle constructor
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Circle::Circle(int InitX, int InitY, int InitRadius) :
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Point (InitX, InitY) // initialize inherited members
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//also invokes Location constructor
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{
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Radius = InitRadius;
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};
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void Circle::Show(void)
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{
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Visible = true;
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circle(X, Y, Radius); // draw the circle
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}
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// Member functions for GMessage class
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//GMessage constructor
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GMessage::GMessage(int msgX, int msgY, int MsgFont,
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int FieldSize, char *text) :
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Location(msgX, msgY)
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//X and Y coordinates for centering message
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{
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Font = MsgFont; // standard fonts defined in graph.h
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Field = FieldSize; // width of area in which to fit text
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msg = text; // point at message
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};
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void GMessage::Show(void)
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{
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int size = Field / (8 * strlen(msg)); // 8 pixels per char.
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settextjustify(CENTER_TEXT, CENTER_TEXT); // centers in circle
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settextstyle(Font, HORIZ_DIR, size); // if size > 1, magnifies
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outtextxy(X, Y, msg); // display the text
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}
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//Member functions for MCircle class
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//MCircle constructor
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MCircle::MCircle(int mcircX, int mcircY, int mcircRadius, int Font,
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char *msg) : Circle (mcircX, mcircY, mcircRadius),
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GMessage(mcircX,mcircY,Font,2*mcircRadius,msg)
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{
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}
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void MCircle::Show(void)
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{
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Circle::Show();
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GMessage::Show();
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}
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main() //draws some circles with text
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{
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int graphdriver = DETECT, graphmode;
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initgraph(&graphdriver, &graphmode, "..\\bgi");
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MCircle Small(250, 100, 25, SANS_SERIF_FONT, "You");
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Small.Show();
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MCircle Medium(250, 150, 100, TRIPLEX_FONT, "World");
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Medium.Show();
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MCircle Large(250, 250, 225, GOTHIC_FONT, "Universe");
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Large.Show();
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getch();
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closegraph();
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return 0;
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}
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